2SD866-Q Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 80 V
• Collector-Base Voltage, max: 130 V
• Emitter-Base Voltage, max: 7 V
• Collector Current − Continuous, max: 7 A
• Collector Dissipation: 40 W
• DC Current Gain (h_fe): 90 to 180
• Transition Frequency, min: 30 MHz
• Operating and Storage Junction Temperature Range: -55 to +150 °C
• Package: TO-220

Here is an image showing the pin diagram of this transistor.The 2SD866-Q transistor can have a current gain of 90 to 180. The gain of the 2SD866 will be in the range from 60 to 260, for the 2SD866-P it will be in the range from 130 to 260, for the 2SD866-R it will be in the range from 60 to 120.Sometimes the "2S" prefix is not marked on the package - the 2SD866-Q might only be marked "D866-Q".The complementary PNP transistor to the 2SD866-Q is the 2SB870-Q.You can replace the 2SD866-Q with the 2SC2334, 2SC2527, 2SC3346, 2SC3710, 2SC3710A, 2SC3834, 2SC4153, 2SD1271, 2SD1271-Q, 2SD1362, 2SD1411, 2SD1411A, 2SD569, 2SD866A, 2SD866A-Q, BD537, BD543B, BD543C, BD545B, BD545C, BD799, BD801, BD809, BDT83, BDT83F, BDT85, BDT85F, BDT87, BDT87F, BDT93, BDT93F, BDT95, BDT95F, BDX77, D44H11, D44H11FP, KSC2334, KSD569, MJE15028, MJE15028G, MJE15030, MJE15030G, MJF15030 or MJF15030G.